Cummins/Onan M1894s / M1895s — Output Frequency (Governor) Adjustment
Adjustments · electronic governor
For the Cummins/Onan M1894s / M1895s, from the Cummins/Onan owner's manual.
Applies to: Cummins/Onan M1894s, Cummins/Onan M1895s, Cummins/Onan MCGBA, Cummins/Onan MCGCA, Cummins/Onan MCGDA, Cummins/Onan MCGDB, Cummins/Onan MCGGA
Procedure
- Warm up the set under partial load (at least 1/4 rated load).
- Turn the Speed potentiometer to obtain specified frequency (60 Hertz - 1800 RPM or 50 Hertz - 1500 RPM).
- Turn the Gain potentiometer clockwise until the governor begins to hunt, then turn it back until there is no audible hunting.
- Connect 1/4 rated load and readjust the Gain potentiometer if necessary.
- Connect rated load in one step; shut down the set if it cannot pick up the load, lengthen the governor rod by half turns of the swivel ends and repeat until it picks up rated load.
- Back off the governor full speed stop screw if necessary.
- Check for stability (no audible hunting) under various loads.
- Stop the set and wait 30 seconds for the turbo to coast down, restart and check for speed overshoot; check for binding in the governor rod if overspeed shutdown occurs.
Specs & values
- 60 Hertz - 1800 RPM or 50 Hertz - 1500 RPM.
Full service-parts list: Cummins/Onan M1894s →, Cummins/Onan M1895s →, Cummins/Onan MCGBA →, Cummins/Onan MCGCA →, Cummins/Onan MCGDA →, Cummins/Onan MCGDB →, Cummins/Onan MCGGA →
Source: Cummins/Onan owner's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.